Presentation of a method to assist the spacecraft equipment designer in determining the proper mix between two means of reliability augmentation--the redundancy or self-repair approach and the spares approach, using manual maintenance skills. For the spares approach, this method or tool allows the designer to specify his requirements for checkout equipment, spares, and crew training to achieve the reliability required of his equipment. (See also RM-4177.) 49 pp. Bibliog.
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